package me.spring.cloud.common.components.util.system;

import javax.servlet.http.HttpServletRequest;

/**
 * @author: luffy
 * @create: 2018-09-25 10:03
 **/
public class RemoteAddressUtil {

  /**
   * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
   */
  public final static String getIpAddress(HttpServletRequest request) {
    //获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
    String ip = request.getHeader("X-Forwarded-For");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
      }
      if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
      }
      if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
      }
      if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
      }
      if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
      }
    } else if (ip.length() > 15) {
      String[] ips = ip.split(",");
      for (int index = 0; index < ips.length; index++) {
        String strIp = ips[index];
        if (!("unknown".equalsIgnoreCase(strIp))) {
          ip = strIp;
          break;
        }
      }
    }
    return ip;
  }
}
